/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Searches the reference graph to find blueprints that are dependent on this BP
static void FindDependentBlueprints ( [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Blueprint, [TArray](API\Runtime\Core\Containers\TArray)< [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * > & DependentBlueprints )